docs: def media_type_str(mediatype):
      """Convert internal API media type to string."""
      if mediatype == const.MEDIA_TYPE_UNKNOWN:
          return 'Unknown'
      if mediatype == const.MEDIA_TYPE_VIDEO:
          return 'Video'
      if mediatype == const.MEDIA_TYPE_MUSIC:
          return 'Music'
      if mediatype == const.MEDIA_TYPE_TV:
          return 'TV'
      return 'Unsupported'